Abstract Porcine source attracts the biotechnological development of natural xenogeneic materials, due to the availability of collagen in soft tissues, but the use of the demineralized organic matrix of cortical bone remains little explored. This study developed a demineralized porcine cortical bone matrix and analyzed the interference of peroxidation on the composition, thermostability, porosity and swelling of the material. Fresh ribs were processed with 3%-30% hydrogen peroxide under single treatment (G1-G4) or double treatment (G5-G8), using native bone (NB) as a control. Physicochemical characterization, porosity histomorphometry and swelling evaluation were performed. There were infrared bands indicative of the prevalence of collagen and residual phosphate groups even after demineralization, mass loss events by thermogravimetry ranging from 94 to 590 °C, being more accelerated in G7 and G8, with all groups below the thermal stability of the NB, as well as similar endothermic events between treatments in differential calorimetry. Changes in lamellar bone morphology occurred in all tested groups, being more conservative in G1 and G2 and more aggressive in G7 and G8. The single treatment dilated pores and kept the matrix closer to the original, while the double treatment significantly enlarged and fused the bone canals mimicking a mesh. The permeable areas in the bone matrix were larger and the hydrophilicity was greater and more persistent for G5-G8 compared to G1-G4 and NB. Single exposure and at lower concentrations of hydrogen peroxide suggest a better modulation of the tested determinants, for the generation of collagen biomaterial applied to bone regeneration. materials tissues explored composition thermostability material 3%30% 330 3% 30% 3 30 3%-30 G1G4 GG G4 G (G1-G4 G5G8, G5G8 G5 G8 , (G5-G8) NB (NB control characterization performed demineralization 9 59 C °C calorimetry original mesh G5-G G1-G determinants regeneration 3%30 33 3%-3 G1G (G1-G G5G (G5-G8 5 3%3 3%- (G5-G

ABSTRACT Purpose: To evaluate the in vivo efficiency of commercial polymeric membranes for guided bone regeneration. Methods: Rat calvarial critical size defects was treated with LuminaCoat (LC), Surgitime PTFE (SP), GenDerm (GD), Pratix (PR), Techgraft (TG) or control (C-) and histomorphometric analysis determined the percentage of new bone, connective tissue and biomaterial at 1 or 3 months. Statistical analysis used ANOVA with Tukey’s post-test for means at same experimental time and the paired Student’s t test between the two periods, considering p < 0.05. Results: New bone at 1 month was higher for SP, TG and C-, at 3 months there were no differences, and between 1 and 3 months PR had greater increase growthing. Connective tissue at 1 month was higher for C-, at 3 months for PR, TG and C-, and between 1 and 3 months C- had sharp decline. Biomaterial at 1 month was higher for LC, in 3 months for SP and TG, and between 1 and 3 months, LC, GD and TG had more decreasing mean. Conclusions: SP had greater osteopromotive capacity and limitation of connective ingrowth, but did not exhibit degradation. PR and TG had favorable osteopromotion, LC less connective tissue and GD more accelerated biodegradation. Purpose regeneration Methods , (LC) (SP) GD, (GD) (PR) (TG C (C- Tukeys Tukey s posttest post Students Student periods 005 0 05 0.05 Results C, differences growthing decline mean Conclusions ingrowth degradation osteopromotion biodegradation (LC (SP (GD (PR (C 00 0.0 0.